Diagnosis:

Spondylolysis

Discussion:

On the oblique view of the lumbar spine, the outline of a dog can seen. The parts of
the dog are as follows: the transverse process-the nose; the pedicle-the eye; the pars
interarticularis-the neck; the superior articular facet-the ear; the inferior articular
facet-the front leg. A break in the neck of the dog, or a dog collar, corresponds to a
fracture in the region of the pars interarticularis, which is specific for spondylolysis.
It is important to recognize as it is a cause of low back pain. A. Normal. B. L5 Pars
defect.